using CPF.Mac.CoreFoundation;
using CPF.Mac.Foundation;
using CPF.Mac.ObjCRuntime;
using System;
using System.Runtime.InteropServices;

namespace CPF.Mac.Security
{
	public class SecIdentity : INativeObject, IDisposable
	{
		internal IntPtr handle;

		public SecCertificate Certificate
		{
			get
			{
				if (handle == IntPtr.Zero)
				{
					throw new ObjectDisposedException("SecIdentity");
				}
				SecIdentityCopyCertificate(handle, out IntPtr _);
				return new SecCertificate(handle, owns: true);
			}
		}

		public IntPtr Handle => handle;

		internal SecIdentity(IntPtr handle)
			: this(handle, owns: false)
		{
		}

		[Preserve(Conditional = true)]
		internal SecIdentity(IntPtr handle, bool owns)
		{
			this.handle = handle;
			if (!owns)
			{
				CFObject.CFRetain(handle);
			}
		}

		[DllImport("/System/Library/Frameworks/Security.framework/Security", EntryPoint = "SecIdentityGetTypeID")]
		public static extern int GetTypeID();

		[DllImport("/System/Library/Frameworks/Security.framework/Security")]
		private static extern IntPtr SecIdentityCopyCertificate(IntPtr handle, out IntPtr cert);

		~SecIdentity()
		{
			Dispose(disposing: false);
		}

		public void Dispose()
		{
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}

		public virtual void Dispose(bool disposing)
		{
			if (handle != IntPtr.Zero)
			{
				CFObject.CFRelease(handle);
				handle = IntPtr.Zero;
			}
		}
	}
}